WTF Is He Doing?

Psalm 5. A prayer for the dead. 

What the actual fuck is going on here?

Youth Swinging from a Tree, c.1300–1310. French Book of Hours, Walters Art Museum, MS W.88, W.88.76R. Public Domain. Image via Wikimedia Commons.

Source:
Book of Hours, c.1300–1310, France. Walters Art Museum, MS W.88, fol. 76r. Public domain. Image via Wikimedia Commons.